Adhesive device



Sept. 3, :1963

FIE

B. BoRlsoF 3,102,634

ADHESIVE DEVICE Filed Dec. 21, 1959 Z 4 ,I .I

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United States Patent O Ship Filed Dee. 2,1, 1959, Ser. No. 861,099 7 Claims. (Cl. 20G-56) The present invention relates to improvements in 'adhesive devices. p

ln adhering sheets of paper to each other in the oice or home, or in adhering paper to backing material, `such as cardboard, metal, or glass, in makeup work `or in connection with photography, it is customary to use either a liquid adhesive, or pressure sensitive tape. Liquid adhesive has a disadvantage lof being inconvenient to apply, and pressure sensitive tape has 'a disadvantage of being visible, and hence detracting yfrom the finished product.

It .is an `object of my invention to provide an adhesive `device which avoids the use of bottles, caps, brushes, spoilage, mess yand other objectionable features `associated with the use of the usual type `of adhesive and with the method yand means of applying the same.

According to my invention, I provide a dry adhesive in the form yof a bar which can be readily grasped by the user land which has certain characteristics which facilitate the application of the dry adhesive to the paper sheet or other material which is -to lbe ladhered to other sheet material or to a backing member. p

It is a further object of my invention to provide an `adhesive `device which embodies both the dry adhesive material and also 1a burnishing member.

It is still another object of my invention to provide an adhesive device which may be readily manipulated by the user without soiling the hands and which may be manipulated in the same manner as a tool.

Other objects, features and advantages will become apparent as the description proceeds.

With reference now to the drawings in which like reference numerals designate like parts:

FIG. l is lan elevation of la preferred embodiment of this invention;

FIG. Z is a top view thereof with a portion shown in section;

FIG. 3 is `an end view; and Y FIG. 4 is a perspective View of the wrapper.

With reference now to FIG. 1, the adhesive device comprises a bar l of dry pressure sensitive adhesive which is surrounded by `a wrapper 2, and which is provided at one end with a burnishing member 3.

Pressure sensitive `adhesives are well known in the art, but cannot be supplied in bar 'form for application by the user because they are sticky or tacky. According to `my invention, however, I provide a non-sticky or nontacky adhesive, which i refer to as a dry adhesive, and furthermore, I provide a dry adhesive which is a solid :at room temperatures, with the result that it can be put up in the form of a bar or stick so that it can be readily applied by the user. An example of an adhesive according to my invention is microcrystalline waxl Preferably the wax should also contain a resin elastomer such as cunrar resin, butyl rubber or natural rubber. A suitable adhesive consists of microcrystalline wax having a melting point of 170 F. 'and 2% by weight of butyl rubber.

The wrapper 2 is a sheet of any material having `a non-fibrous lsurface which tends to adhere to the dry adhesive. One purpose of the wrapper 2 is to impar-t flexural ystrength to the assembly, and this strength is obtained by causing the wrapper to surround Iall tfour sides of the bar ll in intimate contact therewith. This contact .is best obtained by causing the wrapper to `adhere `to the adhesive, but the chanatcer of the adherence must be such that the wrapper may be readily peeled yfrom the surface of the adhesive. The nature ol the adhesive is such that with ordinary paper, after burnishing, the surface of the paper tends to shred if it is peeled from the adhesive. Therefore, I prefer to use a sheet, such las paper, which has a non-fibrous surface so that it may be peeled from the adhesive without shredding or delaminating. Paper coated with a high melting point wax orwith `a non-tacky resin gives satisfactory results. Metal foil `such as aluminum or tin foil is suitable.

When paper is used, it is preferably yof a stift" quality yso that after it is wrapped around the bar, it will tend to maintain the shape of the bar, in much the same manner Ias metallic foil.

However, .it is preferred to provide a wrapper 2 which comprises ya laminated sheet of coated paper 10 `and aluminum foil il, the paper having -a non-tacky resin coating l2, as shown in FIG. 4. The aluminum -foil 11 constitutes the external component and provides an ink retaining surface for receiving printed matter. A wrapper of this material provides both the requisite stiffness and 1a heat insulating effect. The latter is due to the fact that the 'aluminum layer dissipates iin ger heat while the paper layer reduces the transmission of the heat from the aluminum to the wax.

rlhe burnishing member Si` is preferably in the form of a shallow cap having ange meanswhich engage one end of the bar so :as to maintain the same securely in position during the burnishing operation. The burnishing member also has `a 'fairly sharp edge, which is to say, an edge of small radius, in order to provide a small burnishing area and to enable the application of :a high unit pressure when the buinishing member is used to rub two sheets of paper together.

As shown herein, the burnishing member 3 comprises a section of plastic extrusion having outer ilanges `4 Iand S and a central ange 6, the outer ilange embracing the outer surf-ace of the wrapper, land the central ange extending into a recess 7 formed in the bar l. The overall length of the burnishing member is a little less than the width dimension of the bar so that the end surface iof the central tiange 6 will be vobscured by the wrapper, the wrapper `thus serving to prevent sliding motion of the burnishing member in the longitudinal direction.

=In the alternative, the burnishing member can be in the form of an ordinary cap having four flanges rather than the three ilanges shown.

In operation, assuming two sheets of paper are to be adhered to each other, the lower exposed end of the bar is rubbed on the surface of one of the sheets until a substantial amount of the dry adhesive material is transferred to the paper. Then the other sheet is placed over the first sheet in contact with the adhesive coating thus provided, and the two sheets are pressed together. Preferably, the device is then inverted and the burnishing member 3 is rubbed over the upper surface of the second sheet. The application of the rather substantial pressure provided by the burnishing member causes the two sheets to adhere to each other.

The adhesive bond thus provided has certain very desirable characteristics for ordinary home and oice use. With light `burnishing the paper sheets may be separated by peeling, and may then be readhered. With heavy burnishing, in the case of most grades of paper, the actual bond is stronger than the cohesive properties of the sheet with the result that the separation of the parts results in the tearing away of a thin layer of one of the sheets.

As the exposed end of the barv 1 is used up, the wrapper (b 2 may be peeled from adjacent portions of the stick so as to expose a fresh portion.

Although the composition shown is deformable by ordinary finger pressure at temperatures between room temperature and body temperature, this does not detract from the utility of the bar, due to the fact that it is surrounded bythe Wrapper 2. `In this connection, the wrapper appears to exert a heat insulating eifect and also a pressure distributing effect with the result that the wrapper portion of the bar does not exhibit the same deformable qualities `as the exposed end. On the other hand, the deformable properties of the exposed end do assist materially in causing a thin lm of the adhesive y to be transferred to the surface of the paper over which the stick is being applied.v

Furthermore, the Llongitudinal pressure on the bar 1 which is applied incident to the burnishing operation tends to urge the adhesive material of the bar 1 into contact with the surfaces of the iianges 4, 5 and 6 of the burnishing member with a spreading eect which tends to maintain the parts in engagement.

Although only a preferred embodiment of my invention has beenV shown and described here, it will be understood that various modification and changes can be made in the construction shown Without departing from the spirit of my invention as pointed out in the appended claims.

I claim:

1. An adhesive device for use in adhering paper to paper or backing material comprising, in combination, a bar of dry pressure sensitive adhesive material consisting essentially of a microcrystalline Wax having a melting point of substantially 170 Fahrenheit, and a wrapper surrounding the central portion of said bar and having a surface in contact with said bar which adheres rto said dry pressure sensitive adhesive material, said surface having the characteristic such that the Wrapper may be peeled from the bar without leaving portions of the Wrapper on the bar, or portions of the adhesive on the wrapper, and the composition of said bar being characterized by the fact that when said bar is rubbed on said paper or backing material, said microcrystalline Wax is transferred to the surface of said paper or backing material in the form of a coating of irregular thickness and which includes discrete particles of wax.

v2. A11-adhesive device as claimed in claim 1 in which said dry pressure sensitive adhesive composition includes a substance selected from the group consisting of cumar resin, butyl rubber and natural rubber incorporated in said microcrystalline Wax in an amount of substantially 2% by Weight.

3. An adhesive device as claimed in claim 1 in which said Wrapper comprises a laminated sheet of paper and aluminum foil, the aluminum foil being the external component of said laminated sheet and said paper having a non-fibrous coating on the surface which is in Contact with said dry pressure sensitive adhesive material.

4. An adhesive device as claimed in claim 1 including a burnishing member mounted on one end of said bar and comprising a anged member whereof the flanges overlap said Wrapper.

5. An adhesive device as claimed in claim 1 including a burnishing member mounted on one end of said bar and comprising a channel shaped member whereof the flanges overlap said Wrapper, said channel shaped member having a central flange which extends into and is imbedded in the material of said bar.

6. An adhesive device for use in `adhering paper to paper or backing material comprising, in combination, a bar of dry pressure sensitive adhesive material consisting essentially of a microcrystalline Wax having a melting point of substantially Fahrenheit, the composition of said bar being characterized by the fact that when said bar is rubbed on said paper or backing material, said microcrystalline wax is transferred to the surface of said paper or backing material in the formy of a coating of irregular thickness and which includes discrete particles of wax, and holding means surrounding said bar, one end of said bar extending outwardly beyond said holding means. f

7. An adhesive device for use in adhering paper to paper or backing material comprising, in combination, a bar of dry pressure sensitive adhesive material consisting essentially of a microcrystalline wax having a melting point of substantially 170 Fahrenheit, the composition 0f said bar being characterized by the fact that when said bar is rubbed on said paper or backing material, said microcrystalline Wax is transferred to the surface of said paper or backing material in the form of a coating of irregular thickness and which includes discrete particles of wax, holding means surrounding said bar, and a burnishing member located at one end of said holding means and having a relatively sharp edge, said bar extending outwardly beyond the opposite end of said holding means.

References Cited in the file of this patent UNITED STATES PATENTS Re. 3,604 Cushman Aug. 17, 1869 191,856 Holton et al. June 12, 1877 990,354 *Harrington Apr. 25, 1911 1,532,766 Lev'y Apr. 7, 1925 1,560,681 Fisher Nov. 10, y1925 1,944,323 .Kilchling Jan. 23, 1934 2,388,984 Mack Nov. 13, 1945 2,746,910 Mills May 22, 1956 OTHER REFERENCES g Gilue in 'Stick Form, Consumer Bulletin, August 1959, page 2. 

6. AN ADHESIVE DEVICE FOR USE IN ADHERING PAPER TO PAPER OR BACKING MATERIAL COMPRISING, IN COMBINATION, A BAR OF DRY PRESSURE SENSITIVE ADHESIVE MATERIAL CONSISTING ESSENTIALLY OF A MICROCRYSTALLINE WAX HAVING A MELTING POINT OF SUBSTANTIALLY 170* FAHRENHEIT, THE COMPOSITION OF SAID BAR BEING CHARACTERIZED BY THE FACT THAT WHEN SAID BAR IS RUBBED ON SAID PAPER OR BACKING MATERIAL, SAID MICROCRYSTALLINE WAX IS TRANSFERRED TO THE SURFACE OF SAID PAPER OR BACKING MATERIAL IN THE FORM OF A COATING OF IRREGULAR THHICKNESS AND WHHICH INCLUDES DISCRETE PARTICLES OF WAX, AND HOLDING MEANS SURROUNDING SAID BAR, ONE END OF SAID BAR EXTENDING OUTWARDLY BEYOND SAID HOLDING MEANS. 